Revert "minor LGTM fixes"

This reverts commit 58d908531bfb28b46719d74121325a7e6548d98c.

old-commit-hash: 6230f366c5

common/spinner.py

@@ -40,7 +40,7 @@ class Spinner():
     self.close()
 
 
-class FakeSpinner():
+class FakeSpinner(Spinner):
   def __init__(self):
     pass
 

common/text_window.py

@@ -43,7 +43,7 @@ class TextWindow():
     self.close()
 
 
-class FakeTextWindow():
+class FakeTextWindow(TextWindow):
   def __init__(self, s):
     pass